Late afternoon sun over Slim Lake, scattering a bright path across wind-textured water

Washington County Lake Quality

Maine, 139 lakes, measured by Maine DEP

Washington County has 139 monitored lakes, enough that within-county variation matters as much as the county average. Some are deep glacial basins, others are shallow agricultural-watershed waters, and the measurements reflect that mix. 11 of those lakes carry recent nutrient and algae readings. The county-level summary describes that subset, not every water body listed. Taken together, the monitored lakes of Washington County sit near the low-nutrient end of the Maine range.

The county's lakes lean shallow, which makes the readings sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest measured lake is Big Lake.

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Quick Answers for Washington County

Cleanest lakes in Washington County →Best swimming lakes in Maine →

Planning a trip? Check special fishing regulations for Big Lake — or check the official Maine fishing regulations.

All Lakes in Washington County

139 lakes · 11 ranked on readings, 128 without enough sampling11 lakes ranked on readings · 128 without enough sampling, hidden

Include not-rated lakes (128)

#	Lake	Clarity	Phosphorus	Algae	Trophic	Max Depth	Access
1	Big LakeWashington	16.7 ft	8 µg/L	2.7 µg/L	No recent samples	No recent samples	Not recorded
2	East Musquash LakeWashington	20.5 ft	5.5 µg/L	3 µg/L	No recent samples	No recent samples	✓ Public
3	Grand Falls Flowage LakeWashington	14 ft	10 µg/L	3.7 µg/L	No recent samples	No recent samples	✓ Public
4	Lewey LakeWashington	15 ft	9 µg/L	3 µg/L	No recent samples	No recent samples	✓ Public
5	Long LakeWashington	15.6 ft	8.5 µg/L	3 µg/L	No recent samples	No recent samples	✓ Public
6	Pleasant LakeWashington	27.2 ft	5.5 µg/L	2 µg/L	No recent samples	No recent samples	Not recorded
7	Pocumcus LakeWashington	27.9 ft	4 µg/L	2 µg/L	No recent samples	No recent samples	✓ Public
8	Scraggly LakeWashington	19.4 ft	8 µg/L	3 µg/L	No recent samples	No recent samples	Not recorded
9	Sysladobsis LakeWashington	27.8 ft	6 µg/L	2 µg/L	No recent samples	No recent samples	Not recorded
10	West Grand LakeWashington	36.7 ft	3 µg/L	1 µg/L	No recent samples	No recent samples	Not recorded
11	West Musquash LakeWashington	31 ft	4 µg/L	2 µg/L	No recent samples	No recent samples	Not recorded
	Barrows LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	36 ft	Not recorded
	Baskahegan LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	22 ft	Not recorded
	Bearce FlowageWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Bearce LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Beaver LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Beddington LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	60 ft	✓ Public
	Big Greenland LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	6.6 ft	Not recorded
	Big HeathWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Bog Brook FlowageWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Bog LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	46 ft	✓ Public
	Bowles LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	17 ft	Not recorded
	Boyden LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	34 ft	Not recorded
	Clifford LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	50 ft	Not recorded
	Conic LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Cranberry PondWashington	No recent samples	No recent samples	No recent samples	No recent samples	9.8 ft	Not recorded
	Crane Mill Brook ReservoirWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Crawford LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	27 ft	Not recorded
	Crooked Brook FlowageWashington	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	Not recorded
	Crooked Brook LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Eastern LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	36.1 ft	Not recorded
	Farrow LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	86 ft	Not recorded
	Fifth Machias LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	27 ft	Not recorded
	First Chain LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	First LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	First Machias LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	27 ft	Not recorded
	Flowed Land PondsWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Fourth LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Fourth Machias LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	26.2 ft	Not recorded
	Fulton LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	16.4 ft	Not recorded
	Gardner LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	Getchel LakesWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Great Works PondWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Grover LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Hadley LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	31 ft	✓ Public
	Hadley LakesWashington	No recent samples	No recent samples	No recent samples	No recent samples	10 ft	Not recorded
	Hobart BogWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Hobart LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	21 ft	Not recorded
	Horse LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Horseshoe PondWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Hosea Pug LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	36.1 ft	Not recorded
	Hound Brook LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Howard LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	46 ft	Not recorded
	Indian LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	✓ Public
	James PondWashington	No recent samples	No recent samples	No recent samples	No recent samples	30 ft	Not recorded
	Josh PondWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Keeley LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	41 ft	Not recorded
	Keene LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	37 ft	Not recorded
	Knox LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	LaCoute LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	11 ft	Not recorded
	Lake CathanceWashington	No recent samples	No recent samples	No recent samples	No recent samples	74.6 ft	Not recorded
	Lambert LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	60 ft	✓ Public
	Lily LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Little Cathance LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	17 ft	Not recorded
	Little Greenland LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	30 ft	Not recorded
	Little Pickerel PondWashington	No recent samples	No recent samples	No recent samples	No recent samples	23 ft	Not recorded
	Little River LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Little Seavey LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	13.1 ft	Not recorded
	Little Tomah LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	Not recorded
	Love LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	40 ft	Not recorded
	Lower Chain LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Lower Cranberry LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Lower Hot Brook LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	13.1 ft	Not recorded
	Lower Mud LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Lower Oxbrook LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	29.5 ft	Not recorded
	Marks LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	27 ft	Not recorded
	Meddybemps LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	40 ft	Not recorded
	Merrit PondWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Mill PondWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Moneymaker LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	39.4 ft	Not recorded
	Monroe LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Montegail PondWashington	No recent samples	No recent samples	No recent samples	No recent samples	10 ft	Not recorded
	Mopang First LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	13.1 ft	Not recorded
	Mopang LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	76 ft	Not recorded
	Mopang Second LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	Not recorded
	Mud LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Munson LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Nashs LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	56 ft	Not recorded
	North Beaverdam LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	Not recorded
	Orange LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	24 ft	Not recorded
	Orange River ReservoirWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	Orie LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Otter LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	19.7 ft	Not recorded
	Patrick LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	32 ft	Not recorded
	Patten PondWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Peaked Mountain PondWashington	No recent samples	No recent samples	No recent samples	No recent samples	48 ft	Not recorded
	Peep LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	Not recorded
	Pennamaquan LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Pickerel LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Pickerel PondWashington	No recent samples	No recent samples	No recent samples	No recent samples	17 ft	Not recorded
	Pine LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Pleasant River LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	54 ft	Not recorded
	Pocomoonshine LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	40 ft	Not recorded
	Pork Barrel LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Roaring LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	10 ft	Not recorded
	Rocky LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	6.6 ft	Not recorded
	Round LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	15 ft	Not recorded
	Round PondWashington	No recent samples	No recent samples	No recent samples	No recent samples	26 ft	Not recorded
	Sam Hill LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	36.1 ft	Not recorded
	Schoodic LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	37 ft	Not recorded
	Seavey LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Second Chain LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Second LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Second Machias LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	14 ft	✓ Public
	Second Marks LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	22 ft	Not recorded
	Shaw LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	30 ft	Not recorded
	Shiny LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Simpson PondWashington	No recent samples	No recent samples	No recent samples	No recent samples	6.6 ft	Not recorded
	Simsquish LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Six Mile LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	23 ft	✓ Public
	South Beaverdam LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	40 ft	Not recorded
	Southwest PondWashington	No recent samples	No recent samples	No recent samples	No recent samples	34 ft	Not recorded
	Spectacle LakesWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Spruce Mountain LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	43 ft	Not recorded
	Sucker LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	32 ft	Not recorded
	Sunken LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	34 ft	Not recorded
	The BasinWashington	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	Not recorded
	Third Chain LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Third LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	56 ft	Not recorded
	Third Machias LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	34 ft	Not recorded
	Tomah LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	46 ft	Not recorded
	Upper Cranberry LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Upper Flood LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Upper Hot Brook LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	18 ft	Not recorded
	Upper Mud LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Upper Oxbrook LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	17 ft	Not recorded
	Vose PondWashington	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Wabassus LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	✓ Public
	Western LakeWashington	No recent samples	No recent samples	No recent samples	No recent samples	14 ft	Not recorded

NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.

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Source: the Maine Department of Environmental Protection. See data sources.